Please give me some ideas on what else to test.
This is a 1992 Silverado 1500 with a 6 cyl engine. It's got 300,540 miles on it & has been a fantastic truck. I've never had a lick of electrical problems with this rig.
I cranked it up this morning & left it running for about 10 - 15 minutes ( for my wife). I turned it off. About 30 minutes later my wife went out to go to the doctor's and she said she heard a weird noise & it would not crank. She said it wasn;t a pop.
When I turned the key on, all the gauges went wacky, panel lights were flickering - all hell had broken loose. I put a meter on the battery terminals and measured only 9.8V. I disconnected the battery and measured 12.75V on the battery. I ohmed out every fuse I could find, all of them in the fuse block under the steering column & all of them under the hood (next to the coolant reservoir). All were OK.
I connected my battery charger directly to the battery leads & set it on a
10A charge. It still would not crank. Same crazy stuff with gauges and buzzers, etc. I measured 12.6V at the battery teerminals, but I did some spot measuring of voltages at connectors under the dash. I was seeing everything from 7.2V to 9.8V. That can't be right.I don't have any schematics, so I'm taking stabs in the dark.
Can anyone offer advice on what may be the problem, or a good source for a schematic?
The only electrical work done recently was done this past Xmas. I had a new stereo system put in. Back in Feb my drivers side turn signal quit working, it was just the bulb. I have a sneakin suspiscion the folks that put in the stereo may have screwed something up.
Thanks, WS